1. This is a data frame, not a matrix ! -- ?data.frame 2. help.search("sort") is the first thing you should have done. You probably wouldn't have needed to post if you had.
3. The canonical answer is ?order and indexing -- as in: yourdf[order(yourdf$Age),] Note that order() can be used to sort by more than one column -- e.g. Sex and then Age within Sex. 4. The orderBy() function in the doBy package -- and probably there are others -- can do this exactly. Cheers, Bert Gunter Genentech, Inc. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Angelo Scozzarella Sent: Thursday, July 10, 2008 11:21 AM To: r-help@r-project.org Subject: [R] Sorting a matrix Hi, I want to sort a matrix by a specific variable without changing the row binding between variables. Ex. Name Sex Age Fred M 24 John M 18 Mary F 21 ordered by Age Name Sex Age John M 18 Mary F 21 Fred M 24 Thanks Angelo ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.